Treasury Direct is a website run by the United States Treasury, allowing individual
investors to purchase T-Bills and other Treasury securities directly from the U.S. government. Its website allows money to be deposited from and withdrawn to personal bank accounts, and allows rolling repurchase of securities as the currently held items mature. TreasuryDirect offers product information and research across the entire line of
Treasury Securities, from Series EE Savings Bonds to Treasury Notes. New TreasuryDirect accounts offer Treasury Bills, Notes, Bonds, Inflation-Protected Securities (TIPS), and Series I and EE Savings Bonds in electronic form in one account. (Source: Wikipedia: TreasuryDirect)